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Distributed retransmission method based on superposition coded modulation in multihop relay network

A coding modulation and overlapping coding technology, which is applied in radio relay systems, transmission systems, radio transmission systems, etc., to achieve the effects of reducing retransmission delay, obtaining multiplexing gain, and improving cell throughput and capacity

Active Publication Date: 2013-08-14
ALCATEL LUCENT SHANGHAI BELL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the path loss is very different due to the "near-far" effect caused by the large difference between the distance from BS to RS and the distance from BS to MS

Method used

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  • Distributed retransmission method based on superposition coded modulation in multihop relay network
  • Distributed retransmission method based on superposition coded modulation in multihop relay network
  • Distributed retransmission method based on superposition coded modulation in multihop relay network

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Embodiment Construction

[0069] Hereinafter, the present invention will be described with reference to the accompanying drawings. In the following description, some specific embodiments are used for description only, and should not be construed as any limitation on the present invention, but are only examples. Descriptions of conventional structures or constructions are omitted since they may obscure understanding of the present invention.

[0070] In the multi-hop relay network, the introduction of the relay divides the direct link into two or more high-quality links to form a multi-hop path between the base station and the user terminal, which overcomes the problem caused by shadowing and path loss The problems caused by coverage blind spots and low data rates.

[0071] Figure 4 A two-hop relay network is shown where a destination (ie, MS) can receive a signal from a source via two paths: a two-hop relay link and a one-hop direct link. In the two-hop relay link, the physical channel between the ...

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Abstract

A distributed retransmission method is proposed in present invention. The method includes the following steps: Base Station (BS) broadcasts Superposition Coded Modulation (SCM) data bursts to Relay Station (RS) and the first Mobile Station (MS), wherein the SCM data bursts are composed of the superposition of the first coded modulation data bursts which can be supported by transmission channel from BS to the first MS and the second coded modulation data bursts which can be supported by transmission channel from BS to RS, wherein the destination of the second coded modulation data bursts may be the first MS or the second MS in multi-user transmission mode; RS judges whether the first MS has correctly decoded the first coded modulation data bursts, and also judges the channel condition between RS and the first MS, then determines RS retransmission scheme according to the judgments. The retransmission scheme based on SCM proposed in present invention enables the retransmission time delay to be decreased and the cell throughput and capacity to be increased.

Description

technical field [0001] The invention relates to a retransmission scheme used in a wireless communication network, in particular to a distributed retransmission method based on overlapping code modulation (SCM) in a multi-hop relay network. Background technique [0002] In order to improve the reliability of wireless links, retransmission schemes are widely used in current wireless systems. Generally, these schemes assume that erroneous data bursts (ie, data bursts not correctly received at the mobile station (MS)) in the cell must be retransmitted from the corresponding base station (BS) based on a retransmission scheme. In this case, the MS whose channel condition is always poor will experience a large delay in order to receive the data block correctly. [0003] Traditionally, there are three retransmission schemes in multi-hop relay networks. [0004] figure 1 is a schematic diagram showing the first retransmission scheme, which is a traditional point-to-point retrans...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/14
CPCH04B7/155
Inventor 陈继明刘继民王伟
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD